DD6 - chews her on the ends of her long-sleeve shirts - she does it when she's nervous or bored. She's gnawed holes in many of them, including her HSM one

. I had to cut and hem the sleeves into short sleeves to save it. It drives me crazy

. DD3 chews her fingernails and toenails! Tonight I put medical tape on all her fingers for a while. It was cheap tape and fell when she washed her hands, but she says she's gonna stop.
There doesn't seem to be an average age for having kids anymore. Shaelyn's classmates have mom's all over the age range. Some kids grandparents are the same age as other's parents.